
function toggleVisible(level){			
	var el = document.getElementById(level);
	var img = document.getElementById("image_" + level);
	
	if(el){
		if(el.style.display=="block"){
			el.style.display="none";
			img.src="../../commons/img/plus.gif";
		}else if(el.style.display=="") {
			el.style.display="block";
			img.src="../../commons/img/minus.gif";
		}else if(el.style.display=="none") {
			el.style.display="block";
			img.src="../../commons/img/minus.gif";
		}else {
			el.style.display="block";
			img.src="../../commons/img/minus.gif";
		}
	}
	
}